Originally posted by

**Wanganstyle**View PostA torsen can bias torque up to a certain ratio that's dictated by the helical angles of the gear teeth. That's the torque bias ratio. If the torque bias ratio is 3:1, then it can put 3x the torque to one side as it puts to the other side before it slips.

If one wheel's off the ground, then that wheel can take zero torque. 3x zero is zero torque to the other wheel, and it acts like an open.

If that wheel can only take 1000 ftlbs before spinning, then the diff can deliver up to 3000 ftlbs to the other axle, or a total of 4000 ftlbs.

HumVee's use Torsen diffs. If they're offroad with one wheel in the air, that wheel will just spin... BUT if the driver applies 500 ftlbs of brake torque to that axle, you now have 1500 ftlbs available on the other axle, less the 500 ftlbs of brake torque on that axle leaves 1000 ftlbs to move the vehicle, due to the action of the Torsen.

A Quaife puts a spring preload in the middle of a Type 2 Torsen. If the spring preload provides 100 ftlbs, then the Torsen can ALWAYS put 300 fltbs to one axle and move the car even if one wheel is off the ground.

Originally posted by

**the imitator**View PostIf the ring & pinion is applying 3000 ftlbs to the axle, then the friction in the LSD will prevent wheel spin if there's less than 25% of 3000 ftlbs difference in the torque that each tire can take.

E.g. a 25% diff with 3000 ftlbs at the axle can split the torque up to 1875 to one side and down to 1125 to the other side.

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